Constants in JavaScript - JavaScript Tutorial 12
Notes for You:: Constants in JavaScript - JavaScript Tutorial 12
Constant is a named memory location, whose value never changes during the execution of a program.
In order to grab a chunk of memory location and provide a meaningful name to it, we need to declare a variable or a constant.
Declaring a variable or a constant: means allocating a memory location for some data
In order to change the value in a variable or constant, we need to initialize or assign a value to it.
Initializing a variable or a constant: means putting a data value in that allocated memory location
Syntax:
// declaration and initialization of a constant
const NAME_OF_CONSTANT = value;
// declaration and initialization of multiple constants
const NAME_OF_CONSTANT1=value, NAME_OF_CONSTANT2=value,...;
Note: By default the value of a constant is uninitialized.
Example code:
<script type="text/javascript">
const GRAVITY = 9.8;
document.write("Gravity is=",GRAVITY,"<br/>");
const CANVAS_WIDTH=640,CANVAS_HEIGHT=480;
document.write("Canvas width is=",CANVAS_WIDTH,"<br/>");
document.write("Canvas height is=",CANVAS_HEIGHT,"<br/>");
</script>
Note:
replace < with less-than symbol
replace > with greater-than symbol
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